Although second language acquisition researches based on the theory of principles and parameters have arrived at different conclusions, the theory has provided useful research methods.

虽然以原则与参数理论为基础的第二语言习得的研究结论分歧很大，但是原则与参数理论为第二语言习得研究提供了研究的方法与途径。

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Although second language acquisition researches based on the theory of principles and parameters have arrived at different conclusions, the theory has provided useful research methods.

虽然以原则与参数理论为基础的第二语言习得的研究结论分歧很大，但是原则与参数理论为第二语言习得研究提供了研究的方法与途径。

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